My dad used to sing this to my brother and me and I only remember a few lines. I used to think it was a part of "Aint We Crazy" but late learned that it was not. Some of the lines (in no real order) are as follows:

They're long and they're gray
They're always in the way
They hide the dirt on pappy's shirt
They're always in the way.

Grandma chews them in her sleep
She thinks she's eating Shreaded Wheat...

...he hid behind his whiskers and fooled the enemy..

If anyone knows this song or it's origin I would be grateful.